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Fire mouth rubbing after water change

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One of my small firemouth cichlids(3 inches) is rubbing his side on the sand. I just did a little over 50% water change and he was fine before the water change. He only does it in his cave, he will swim out chase the other firemouths away and then rub against the sand again. I used water conditioner, and all the other fish are swimming around completely normal.